Hang on, the OP has said she tried to leave him but her persuaded her to come back.
He has a mind of his own persumably - she has not chained him to the marriage.
The financial thing is all a red herring - the OP earns her own money in any case. Presumably, her partner would be seen as a good catch by other women some of whom, by the way, consider a high earning partner as an asset in a marriage (just saying!)
If the OP is as horrible as some of you are claiming, then why would her husband want to stay with her?
I think there are literally thousands, if not hundreds of thousands of people in marriages and/or long term relationships (especially, but not exclusively where children are involved) who stay in the relationship for the types of reasons that the OP describes.
For security, for convenience, for economy, for the children, because they can't be bothered with the hassle of a divorce, because their parents would be upset, because their friends would disapprove, because where would the cat go, because they may end up with someone else who is even worse, because they may regret the decision to split up, because they do not want to admit to a 'failed' marriage and so on and so forth.
Not saying any of the reasons are NECESSARILY good reasons to stay - then again they are probably GOOD ENOUGH reasons not to leave.
And yes, many of those people are probably secretly fantasising about shagging the milkman (or whoever). Heck, some of them probably ARE shagging the milkman.
So, to answer your question OP, yes there are countless people out there who are staying in relationships when they are not necessarily madly in love, or madly in lust, or even madly in like. How do I know? Because I speak to my friends, because I read these kind of boards, because, realistically, if you think about it, most people are going to struggle to be in a 'perfect' monogamous relationship for 50+ years. That's just being honest.
I am one of them - I get on with my partner fantastically, he is a great father, but I have never really lusted madly for him. As others have pointed out those kind of alpha male types who are dominant with a lot of sex appeal tend not to make such good husbands/fathers (having had one as a father myself I can vouch for that).